I mostly use Warm and Natural or Warm and White because I like the way it feels and the way it handles. I can leave larger areas unquilted and it still holds its shape. My oldest quilt is soft as silk by now so this batting washes beautifully. I also like the antique look.
Next I use the Hobbs 80/20. It seems to drape a bit better than W&N.
Today I bought a recycled mix to try out. Gotta branch out from time to time.
My least favorite is polyester - particularly the mattress pad I ended up with recently. I will use it to upholster the chairs and then pass it on. Holy cow - getting that under the machine is like maneuvering 2x4s. It will not bend - only fold over and crease. Whatever possessed me to say "sure I can use that" is beyond me.